Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4869938 | Polypropylene sheet for press-through packages, production process thereof, and polypropylene resin composition | Katsuyuki Usami, Hajime Sentoku, Takashi Takahashi, Kazuharu Kanezaki | 1989-09-26 |
| 4826735 | Polypropylene resin composition, a multi-layered sheet comprised thereof and a production process therefore | Jinichi Yazaki, Akihiko Tamura, Hideo Amemiya, Takashi Miyazaki | 1989-05-02 |